# -*- coding: utf-8 -
# Copyright 2008 by Benoît Chesneau <benoitc@e-engura.com>
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from calendar import timegm
from datetime import datetime
from time import strptime, struct_time

def datetimestr_topython(value):
    if isinstance(value, basestring):
        try:
            value = value.split('.', 1)[0] # strip out microseconds
            value = value.rstrip('Z') # remove timezone separator
            timestamp = timegm(strptime(value, '%Y-%m-%dT%H:%M:%S'))
            value = datetime.utcfromtimestamp(timestamp)
        except ValueError, e:
            raise ValueError('Invalid ISO date/time %r' % value)
    return value


def datetime_tojson(value):
    if isinstance(value, struct_time):
        value = datetime.utcfromtimestamp(timegm(value))
    elif not isinstance(value, datetime):
        value = datetime.combine(value, time(0))
    return value.replace(microsecond=0).isoformat() + 'Z'